Diaphragm valve



FIG. 1 is a top perspective view of a diaphragm valve showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a cross sectional view taken on line 4--4 of FIG. 3 and;

FIG. 5 is a cross sectional view taken on line 5--5 of FIG. 3. 

The ornamental design for a diaphragm valve, as shown. 